I'm trying to restore this old table. It's solid wood, and the top needs a good sand and oil, so the colour will probably lighten a bit once I've done that. But there are some quite deep grooves in it:

I've put a penny in it for scale.

What can I fill it with? I don't like fake wood or wood-coloured filler. I wondered about some plain black filler. Or is it best just to leave it - but the grooves are definitely big enough to be dirt traps?

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